feat(tht): column_promoted/column_excluded decision types (F4)

harness/tests/test_column_decisions.py

@@ -0,0 +1,17 @@
+from tht.decisions import DecisionType
+import typing
+
+
+def test_column_decision_types_exist():
+    allowed = set(typing.get_args(DecisionType))
+    assert "column_promoted" in allowed
+    assert "column_excluded" in allowed
+
+
+def test_f4_emits_column_types():
+    import yaml
+    from pathlib import Path
+    wf = yaml.safe_load(Path("workflow.yaml").read_text())
+    f4 = next(p for p in wf["phases"] if p["id"] == "F4")
+    assert "column_promoted" in f4["emits"]
+    assert "column_excluded" in f4["emits"]